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Bypass switch self-triggering circuit of multilevel converter submodule

A multi-level converter and bypass switch technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc.

Active Publication Date: 2017-09-08
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing sub-module bypass of the existing multi-level converter, and propose a self-triggering circuit of the sub-module bypass switch of the multi-level converter

Method used

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  • Bypass switch self-triggering circuit of multilevel converter submodule
  • Bypass switch self-triggering circuit of multilevel converter submodule

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0012] Such as figure 1 As shown, the self-triggering circuit of the bypass switch of the sub-module of the multilevel converter of the present invention is charged by the bypass circuit diode D C , bypass circuit charging resistor R 1 , the first normally closed contact switch K 1 , The second normally closed contact switch K 2 , Normally open contact switch K 3 , and the bypass circuit storage capacitor C C constitute. The self-triggering circuit of the bypass switch of the sub-module is connected to the sub-module of the multi-level converter through an electrical circuit and a control circuit; the charging diode D of the bypass circuit C The anode of the sub-module is connected to the positive output terminal P of the sub-module, and the charging resistor R of the bypass circuit 1 connected to the charging diode D C The cathode and ...

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Abstract

A bypass switch self-triggering circuit of a multilevel converter submodule comprises a bypass circuit charging diode DC, a bypass circuit charging resistor R1, a first normally-closed contact switch K1, a second normally-closed contact switch K2, a normally-open contact switch K3 and a bypass circuit energy storage capacitor CC. The bypass switch self-triggering circuit of the sub-module is connected with the multilevel converter submodule through an electrical circuit and a control circuit. When the multilevel converter submodule is in a normal state, normally-closed contact relays Q1 and Q2 of the bypass switch self-triggering circuit are in disconnection states, the normal running of the sub-module is not affected; and when a bypass switch cannot be controlled by the submodule due to faults of a submodule energy taking power supply and a submodule control board, the normally-closed contact relays Q1 and Q2 of the bypass switch self-triggering circuit are in closed states, the submodule is automatically bypassed, and the fact that the whole multilevel converter cannot normally work caused by a fault of an internal component of the submodule is prevented.

Description

technical field [0001] The invention relates to a multilevel converter, in particular to an H-bridge multilevel converter, a modular multilevel converter cascaded multilevel converter sub-module bypass switch self-triggering circuit. Background technique [0002] Modular multilevel converter (MMC), cascaded H-bridge (CHB) converter Cascaded multilevel converter has a wide range of applications in high-voltage and large-capacity power conversion. Applications, such as high-voltage DC transmission, high-voltage AC transmission, reactive power compensation device, harmonic compensation device, smart grid system, etc. [0003] In order to achieve high reliability of the converter operation, the basic power unit of the cascaded multilevel converter, that is, the sub-module is generally designed with an automatic bypass function, that is, when the internal bypass switch of the sub-module fails, the It is bypassed to protect the failed sub-module and avoid affecting the normal ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02M1/32
CPCH02M1/32H02M7/00H02M1/0067H02M1/325
Inventor 李子欣王平李耀华高范强徐飞楚遵方
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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